Over temperature/pressure safety device for diesel particulate filters

摘要

A safety device for an exhaust gas aftertreatment system provides an alternative exhaust route in case of high temperatures or pressures within the regenerating particulate filter of the exhaust gas aftertreatment system that may cause damage to the particulate filter. The safety device comprises a valve that redirects the flow of exhaust gas from the regenerating particulate filter when specified temperature or pressure thresholds are met or exceeded.

主权项

1. A safety device for an exhaust gas aftertreatment system comprising:
a valve located upstream of a first diesel particulate filter and a second diesel particulate filter; a pressure relief device located upstream of the second diesel particulate filter; a controller configured to control an actuator which operates the valve between an open state and a closed state such that no exhaust flow passes to the first diesel particulate filter when the valve is closed when the system detects one or more of a predetermined temperature condition of the first diesel particulate filter, and a predetermined pressure condition within the first diesel particulate filter, and a diagnostic condition of the system; and wherein the pressure relief device is a rupture disk.